Update pint requirement from ~=0.17 to ~=0.20

[dependabot]

Updates the requirements on pint to permit the latest version.

Changelog

Sourced from pint's changelog.

0.20 (2022-10-25)

• Reorganized code into facets. Each facet encapsulate a Pint functionality. (See #1466, #1479)
• The definition parser is now completely appart, making it easy to try other formats. (See #1595)
• Extra requires for optional packages are now explicit in setup.cfg (See #1627)
• Parse both Greek mu and micro Unicode points without error. (Issue #1030, #574)
• Added angular frequency documentation page.
• Move ASV benchmarks to dedicated folder. (Issue #1542)
• Implement numpy.broadcast_arrays (#1607)
• An ndim attribute has been added to Quantity and DataFrame has been added to upcast types for pint-pandas compatibility. (#1596)
• Fix a recursion error that would be raised when passing quantities to cond and x. (Issue #1510, #1530)
• Update test_non_int tests for pytest.
• Create NaN-value quantities of appropriate non-int-type (Issue #1570).
• New documentation format and organization!
• Better support for pandas and dask.

0.19.2 (2022-04-23)

• Add the separate_format_defaults registry setting (Issue #1501, PR #1503)
• Handle definitions @​import from relative paths on Windows (Issue #1508, thanks khaeru)

0.19.1 (2022-04-06)

• Provide a method to iter the definitions in the order they appear, recursing the imported files. (Issue #1498)

0.19 (2022-04-04)

• Better separation between parsing and loading of definitions. Implement a parsed "binary" version of "textual" definition files. Infrastructure to disk cache parsed definition files and RegistryCache resulting in a 10X speed up in registry instantiation when enabled. (Issue #1465)
• Deprecate the old format defaulting behavior and prepare for the new one (Issue #1407)
• Fix a bug for offset units of higher dimension, e.g. gauge pressure. (Issue #1066, thanks dalito)

... (truncated)

Commits

• f334aa8 Preparing release 0.20
• 72f79a1 Updated CHANGES
• cd83ba9 Merge pull request #1630 from hgrecco/develop
• 85c1d34 Added new extra requires
• f9931f4 Test against Python 3.11
• 2d8bfcd Pull flexparser.py from https://github.com/hgrecco/flexparser
• bb7fcb6 Merge #1610
• 0dc0935 Merge branch 'master' into broadcast_arrays
• 385544a Merge #1596
• b334e8a Merge pull request #1622 from hgrecco/develop
• Additional commits viewable in compare view

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